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There may be built in internal alarms tied into load meters- which measure the stresses on the cable- and thus would theoretically stop the crane if the operator attempted an overdimensional lift. ( these have only been out since the seventies- and many working cranes are a lot older!0- secondly many cranes, including all RR models- especially steam had whistles which could be used in a pre-arranged code to warn of trouble- also used, practically to dispatch dump trucks and freight cars without slowing up the pace too much. Te Big l8-foot Broad Gauge cranes at Kopper Koke had a melodious three-barreled ( Trident, you might say) whistle- used for signal purposes.

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